Blwyddyn golau: Gwahaniaeth rhwng fersiynau

!Ffactor ([[blwyddyn golau|ly]])

|10^-9−9

(Mae'r Lleuad tua 384400 [[kilomedr]] o'r Ddaear, ar gyfartaledd. 384400km384400 km ÷ 300000km300000 km/eiliad (tua [[cyflymder golau]]) ≈ 1.28 eiliad)

|10^-6−6

|Un [[uned seryddol]] (AU) (y pellter o'r [[Haul]] i'r [[Ddaear]]). Mae'n cymryd tua 8.31 munud i olau deithio'r pellter hwn. <ref>Prifysgol Gorllewin Ontario [http://pcl.physics.uwo.ca/SunEarth/index.html ''The Sun-Earth Connection'']</ref>

|10^-3−3

|Roedd [[Voyager 1]], y prôb mwyaf pell hyd yn hyn, tua 13 oriau golau i ffwrdd o'r Ddaear ym Medi [[2004]]. Cymerodd Voyager 27 blwyddyn i deithio'r pellter hynny. <ref>Cyhoeddiad gwasg [[NASA]] (05-131) 2005-05-24: [http://www.nasa.gov/home/hqnews/2005/may/HQ_05131_Voyager_agu.html ''Voyager Spacecraft Enters Solar System's Final Frontier'']</ref>

|Y [[seren]] agosaf (heblaw'r Haul), yw [[Proxima Centauri]] sydd o gwmpas 4.22 blwyddyn golau i ffwrdd. <ref>[[NASA]]: [http://heasarc.gsfc.nasa.gov/docs/cosmic/nearest_star_info.html ''Cosmic Distance Scales - The Nearest Star'']</ref> <ref>[http://www.daviddarling.info/encyclopedia/P/ProximaCen.html Proxima Centauri (Gliese 551)], ''Encyclopedia of Astrobiology, Astronomy, and Spaceflight''</ref>

|Mae [[canol galactig]] ein [[galaeth]], y [[Llwybr Llaethog]], tua 8 [[parsec|kiloparsec]] i ffwrdd. <ref>F. Eisenhauer, ''et al.'', "[http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v597n2/17431/17431.web.pdf ''A Geometric Determination of the Distance to the Galactic Center'']" (pdf, 93KB), ''Astrophysical Journal'' 597 (2003) L121-L124</ref> <ref>McNamara, D. H., ''et al.'', "[http://www.journals.uchicago.edu/PASP/journal/issues/v112n768/200037/200037.web.pdf ''The Distance to the Galactic Center'']" (pdf, 298KB), ''The Publications of the Astronomical Society of the Pacific'', '''112''' (2000), pp. 202–216.</ref>